Pull-rod bearing



F. B. DUNLAP. PULL ROD BEARING. APPLICATION FILED APILZZ, ISIIZO.

3,420,025. Patented June 20, 1922.

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FORREST IB. DUNLAP, OF TULSA, OKLAHOMA, ASSIGNOR 0F ONE-HALF TO HAROLDL. SULLIVAN, OF TULSA,'OKLAH`OMA.

PULL-ROD BEARING.

Application led April 22,v

To all whom t may concern Be it known that I, F onnnsr B. DUNLAP, acitizen of the United States, residing at Tulsa, in the county of Tulsaand State ofV Oklahoma, have invented certain new and usefulImprovements in Pull-Rod Bearings; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same.

The object of the invention is to provide a simple and efcient pull rodbearing for oil well pump rigs and the like wherein the frictionordinarily incident to the operation ofthe pump by reason of the supportof the pull rod between the motor or pump operating mechanism and thewell may be minimized to secure the maximum eiiiciency of the pumpingmechanism or of the power eX- pended in connection with the operation ofpumping by the motor, and furthermore to facilitate the mounting orrunning of the pull rod in arranging the pump mechanism for operation,and with these objects in view the invention consists in a constructionand combination of parts of which a preferred embodiment is shown in theaccompanying drawing, wherein- Figure 1 is a general view of a pumpingplant showing the pull rod supported at intervals by bearings embodyingthe invention.

Figure 2 is a detail view in section of one of the pull rod bearings.

Figure 3 is a side view of the same.

It is common in the oil eld to operate a number of pumps from a commonplant or motor located at considerable distances from the wells and tocommunicate motion from the engine or motor to the several pumps bymeans of pull rods 10 which are extended horizontally or insubstantially horizontal directions radially from the engine or motor,and it is with a view to minimizing the friction due to the movement ofthe pull rod at the necessary points of support thereof between themotor and the well that the device embodying the invention has beendesigned, and in the form illustrated in the drawings the-same consistsessentially of a standard 11 preferably tubular and consisting of a pipeof suitable dimensions which may readily be driven into the ground atany desired point and at intervals throughout the length of theSpecification of Letters Patent. Pajnted June 20, 1922.

1920. serial No. 375,802.

run of the pull rod,` and heads 12 which are swiveled upon thesestandards and carry grooved rollers 13 for guiding and supporting pullrods. As shown the head is provided with a depending spindle portion 14fitted in the upper end of the tubular standard and held from downwarddisplacement by any suitable means such as a shoulder 15 thereon, and alooped housing 16 yrising from the spindle and supporting a tubularshaft 17 extending through a bushing 18 carried by the roller, suitableterminal washers 19 being provided upon the bushing to hold the sidesurfaces of the roller out of frictional contact with the inner surfacesof the walls of the housing. The shaft upon which the roller is mountedis preferably tubular as indicated and connected with one end thereof isa grease cup 20 by which a lubricant may be forcibly fed into the boreof the shaft to be expelled through a feed opening 21 formed in the wallof the shaft within the bushing to minimize the friction of the rollerthereon. Anti-friction rollers 22 may also be interposed between thebushing and the shaft to still further reduce the friction, and ifdesired the lower portion of the housing may be closed at its ends toform an oil pan 23 in which the lower portion of the periphery of thewheel dips, so that as the latter turns it will carry the oil to thesurface which is traversed by the pull rod.

By means of such a construction and arrangement, after the erection ofthe apparatus and the initial oiling of the same, or the adjustment ofthe grease cup, the operation may continue indefinitely without furtherconsideration by the attendant and without the disadvantages incident toheating and consequent injury which is common in the ordinary practice.It will be obvious that the device may be set up at any desiredintervals and may be removed and redisposed in relation to other wellswith a minimum effort and loss of time and the direction of movement ofthe pull rod will insure the maintenance of the head in the upperdirectional position with reference thereto without requiring theattention of the operator.

What is claimed is 1. A bearing for a well pump pull rod comprisingaroller, a shaft to support the roller, a housing for the roller havingspaced side and housing partly Closing the sides of the housing andterminating relatively Vcloseto the periphery-of the roller to form areser- Voir for oil to lubrieate said periphery.

3. A bearing' for a Well pump pull rod oom- `prising a head, a rollerthereon, a tubular shaft supporting the roller having a Closure head 4atone end, an oil cup at the other end,

y and means of escape for oil through the shaft to `journal the surfaceof the roller.V

In testimony whereof I affix my signature vin presence of two Witnesses.

FORREST B. DUNLAP.

Witnesses: y

W. E. DAVIDSON, MASON Krr'rnss.

